Rapid cognitive assessment tools for screening of mild cognitive impairment in the preoperative setting: A systematic review and meta-analysis

•We reviewed brief (≤5 mins) index tools for screening mild cognitive impairment (MCI).•Rapid Cognitive Screen, Six-item Screener, and Mini-Cog require further validation.•Clock Drawing Test has low sensitivity and specificity for MCI screening.•No short MCI index tools have been validated in the preoperative setting